Not logging encrypted sessions by default is not a good idea.

We can assume the user's PC is safe, otherwise encryption won't help
anyway as the key could be stolen. If the user is too paranoid, he can
still disable it and thus also force the other end to stop logging.

src/common/config.py

@@ -190,7 +190,7 @@ class Config:
 		'tabs_always_visible': [opt_bool, False, _('Show tab when only one conversation?')],
 		'tabs_border': [opt_bool, False, _('Show tabbed notebook border in chat windows?')],
 		'tabs_close_button': [opt_bool, True, _('Show close button in tab?')],
-		'log_encrypted_sessions': [opt_bool, False, _('When negotiating an encrypted session, should Gajim assume you want your messages to be logged?')],
+		'log_encrypted_sessions': [opt_bool, True, _('When negotiating an encrypted session, should Gajim assume you want your messages to be logged?')],
 		'e2e_public_key': [opt_bool, False, _('When negotiating an encrypted session, should Gajim prefer to use public keys for identification?')],
 		'chat_avatar_width': [opt_int, 52],
 		'chat_avatar_height': [opt_int, 52],